The port was first committed to the NetBSD source tree as NetBSD/x86_64
on June 19th, 2001 and renamed to NetBSD/amd64 on April 26th, 2003.

The original work to do this port was done by Frank van der Linden at
Wasabi Systems, assisted by
AMD, who provided the simulator
(Simics VirtuHammer), pre-release hardware and access to a range
of Opteron hardware through the
AMD Developer Center.

The port is fully functional. It has been tested on single-CPU and
multiprocessor (SMP) Opteron configurations. Since the release of NetBSD 2.0,
it is a completely supported platform.